Ordinary household materials such as band aids can emit their own light.
No, you’re not losing your mind – that Winter fresh Life Saver you just chomped down on did just emit a few sparks! This sort of event can also be duplicated when you remove band aids from their adhesive backing. Both of these phenomena are examples of triboluminescence: an optical in which light is produced when chemical bonds are broken within a material.
This can occur as a result of the material being pulled apart, ripped, rubbed, scratched, or crushed. [reference]